1
2
: any of several virus diseases marked especially by respiratory or intestinal symptoms
Examples of flu in a Sentence
He came down with a bad bout of the flu.
Recent Examples on the Web
In the prodromal phase, infected people have vague flu-like symptoms, often fever, fatigue, headache, body aches, abdominal cramps, and gastrointestinal disturbances.
—
ArsTechnica, 8 May 2026
Early on in a hantavirus infection, someone will likely experience mild flu-like symptoms, followed by respiratory issues, like shortness of breath.
—Elizabeth Yuko, Rolling Stone, 8 May 2026
Federal officials then reduced the number of vaccines recommended for children, no longer broadly recommending flu, rotavirus, hepatitis A, hepatitis B, some forms of meningitis and RSV.
—Joseph States, Chicago Tribune, 8 May 2026
Following the avian flu outbreak, which began in December, advocates called city leaders to do a better job of cleaning trash, feeding swans, and improving infrastructure and water quality.
—Ryan Gillespie, The Orlando Sentinel, 8 May 2026
See All Example Sentences for flu
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ArsTechnica, 8 May 2026
Early on in a hantavirus infection, someone will likely experience mild flu-like symptoms, followed by respiratory issues, like shortness of breath.
—Elizabeth Yuko, Rolling Stone, 8 May 2026
Federal officials then reduced the number of vaccines recommended for children, no longer broadly recommending flu, rotavirus, hepatitis A, hepatitis B, some forms of meningitis and RSV.
—Joseph States, Chicago Tribune, 8 May 2026
Following the avian flu outbreak, which began in December, advocates called city leaders to do a better job of cleaning trash, feeding swans, and improving infrastructure and water quality.
—Ryan Gillespie, The Orlando Sentinel, 8 May 2026
See All Example Sentences for flu
Cite this Entry
“Flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flu. Accessed 10 May. 2026.
Copy CitationKids Definition
flu
noun2
: any of several virus diseases that are something like a cold
flu-like
adjective
ˈflü-ˌlīk
Medical Definition
flu
noun1
2
: any of several chiefly viral illnesses marked especially by respiratory or gastrointestinal symptoms see intestinal flu
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